Support disk caching mode config

ChangeLog

@@ -1,4 +1,16 @@
-Fri Jan 30 16:12:22 GMT 2009 Daniel P. Berrange <berrange@redhat.com>
+Fri Jan 30 17:12:22 GMT 2009 Daniel P. Berrange <berrange@redhat.com>
+
+	Support <driver cache='none|writeback|writethrough'/> cache
+	control options
+	* src/domain_conf.c, src/domain_conf.h: Add supported for
+	disk caching mode options
+	* src/qemu_conf.c, src/qemu_conf.h: Detect supported cache
+	mode options for -drive and use them when launching QEMU
+	* docs/schemas/domain.rng: Document cache mode options
+	* tests/qemuxml2argvtest.c: Validate cache mode processing
+	* tests/qemuxml2argvdata/: Data files for cache mode options
+
+Fri Jan 30 17:12:22 GMT 2009 Daniel P. Berrange <berrange@redhat.com>
 
 	Fix crash when using bogus arch type
 	* src/capabilities.c, src/capabilities.h: Add method to query

docs/schemas/domain.rng

@@ -426,6 +426,25 @@
     -->
   <define name='driver'>
     <element name='driver'>
+      <choice>
+	<group>
+	  <ref name='driverFormat'/>
+	  <optional>
+	    <ref name='driverCache'/>
+	  </optional>
+	</group>
+	<group>
+	  <optional>
+	    <ref name='driverFormat'/>
+	  </optional>
+	  <ref name='driverCache'/>
+	</group>
+      </choice>
+      <empty/>
+    </element>
+  </define>
+
+  <define name='driverFormat'>
     <attribute name='name'>
       <ref name='genericName'/>
     </attribute>
@@ -434,8 +453,16 @@
 	<ref name='genericName'/>
       </attribute>
     </optional>
-      <empty/>
+  </define>
-    </element>
+
+  <define name='driverCache'>
+    <attribute name='cache'>
+      <choice>
+	<value>none</value>
+	<value>writeback</value>
+	<value>writethrough</value>
+      </choice>
+    </attribute>
   </define>
 
   <define name='filesystem'>

src/domain_conf.c

@@ -1,7 +1,7 @@
 /*
  * domain_conf.c: domain XML processing
  *
- * Copyright (C) 2006-2008 Red Hat, Inc.
+ * Copyright (C) 2006-2009 Red Hat, Inc.
  * Copyright (C) 2006-2008 Daniel P. Berrange
  *
  * This library is free software; you can redistribute it and/or
@@ -91,6 +91,12 @@ VIR_ENUM_IMPL(virDomainDiskBus, VIR_DOMAIN_DISK_BUS_LAST,
               "usb",
               "uml")
 
+VIR_ENUM_IMPL(virDomainDiskCache, VIR_DOMAIN_DISK_CACHE_LAST,
+              "default",
+              "none",
+              "writethrough",
+              "writeback");
+
 VIR_ENUM_IMPL(virDomainFS, VIR_DOMAIN_FS_TYPE_LAST,
               "mount",
               "block",
@@ -568,6 +574,7 @@ virDomainDiskDefParseXML(virConnectPtr conn,
     char *source = NULL;
     char *target = NULL;
     char *bus = NULL;
+    char *cachetag = NULL;
 
     if (VIR_ALLOC(def) < 0) {
         virReportOOMError(conn);
@@ -617,6 +624,7 @@ virDomainDiskDefParseXML(virConnectPtr conn,
                        (xmlStrEqual(cur->name, BAD_CAST "driver"))) {
                 driverName = virXMLPropString(cur, "name");
                 driverType = virXMLPropString(cur, "type");
+                cachetag = virXMLPropString(cur, "cache");
             } else if (xmlStrEqual(cur->name, BAD_CAST "readonly")) {
                 def->readonly = 1;
             } else if (xmlStrEqual(cur->name, BAD_CAST "shareable")) {
@@ -713,6 +721,13 @@ virDomainDiskDefParseXML(virConnectPtr conn,
         goto error;
     }
 
+    if (cachetag &&
+        (def->cachemode = virDomainDiskCacheTypeFromString(cachetag)) < 0) {
+        virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR,
+                             _("unknown disk cache mode '%s'"), cachetag);
+        goto error;
+    }
+
     def->src = source;
     source = NULL;
     def->dst = target;
@@ -730,6 +745,7 @@ cleanup:
     VIR_FREE(device);
     VIR_FREE(driverType);
     VIR_FREE(driverName);
+    VIR_FREE(cachetag);
 
     return def;
 
@@ -2756,6 +2772,7 @@ virDomainDiskDefFormat(virConnectPtr conn,
     const char *type = virDomainDiskTypeToString(def->type);
     const char *device = virDomainDiskDeviceTypeToString(def->device);
     const char *bus = virDomainDiskBusTypeToString(def->bus);
+    const char *cachemode = virDomainDiskCacheTypeToString(def->cachemode);
 
     if (!type) {
         virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR,
@@ -2772,20 +2789,23 @@ virDomainDiskDefFormat(virConnectPtr conn,
                              _("unexpected disk bus %d"), def->bus);
         return -1;
     }
+    if (!cachemode) {
+        virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR,
+                             _("unexpected disk cache mode %d"), def->cachemode);
+        return -1;
+    }
 
     virBufferVSprintf(buf,
                       "    <disk type='%s' device='%s'>\n",
                       type, device);
 
     if (def->driverName) {
+        virBufferVSprintf(buf, "      <driver name='%s'", def->driverName);
         if (def->driverType)
-            virBufferVSprintf(buf,
+            virBufferVSprintf(buf, " type='%s'", def->driverType);
-                              "      <driver name='%s' type='%s'/>\n",
+        if (def->cachemode)
-                              def->driverName, def->driverType);
+            virBufferVSprintf(buf, " cache='%s'", cachemode);
-        else
+        virBufferVSprintf(buf, "/>\n");
-            virBufferVSprintf(buf,
-                              "      <driver name='%s'/>\n",
-                              def->driverName);
     }
 
     if (def->src) {

src/domain_conf.h

@@ -81,6 +81,15 @@ enum virDomainDiskBus {
     VIR_DOMAIN_DISK_BUS_LAST
 };
 
+enum  virDomainDiskCache {
+    VIR_DOMAIN_DISK_CACHE_DEFAULT,
+    VIR_DOMAIN_DISK_CACHE_DISABLE,
+    VIR_DOMAIN_DISK_CACHE_WRITETHRU,
+    VIR_DOMAIN_DISK_CACHE_WRITEBACK,
+
+    VIR_DOMAIN_DISK_CACHE_LAST
+};
+
 /* Stores the virtual disk configuration */
 typedef struct _virDomainDiskDef virDomainDiskDef;
 typedef virDomainDiskDef *virDomainDiskDefPtr;
@@ -92,6 +101,7 @@ struct _virDomainDiskDef {
     char *dst;
     char *driverName;
     char *driverType;
+    int cachemode;
     unsigned int readonly : 1;
     unsigned int shared : 1;
     int slotnum; /* pci slot number for unattach */
@@ -615,6 +625,7 @@ VIR_ENUM_DECL(virDomainLifecycle)
 VIR_ENUM_DECL(virDomainDisk)
 VIR_ENUM_DECL(virDomainDiskDevice)
 VIR_ENUM_DECL(virDomainDiskBus)
+VIR_ENUM_DECL(virDomainDiskCache)
 VIR_ENUM_DECL(virDomainFS)
 VIR_ENUM_DECL(virDomainNet)
 VIR_ENUM_DECL(virDomainChr)

src/qemu_conf.c

@@ -1,7 +1,7 @@
 /*
  * config.c: VM configuration management
  *
- * Copyright (C) 2006, 2007, 2008 Red Hat, Inc.
+ * Copyright (C) 2006, 2007, 2008, 2009 Red Hat, Inc.
  * Copyright (C) 2006 Daniel P. Berrange
  *
  * This library is free software; you can redistribute it and/or
@@ -61,6 +61,22 @@ VIR_ENUM_IMPL(virDomainDiskQEMUBus, VIR_DOMAIN_DISK_BUS_LAST,
               "uml")
 
 
+VIR_ENUM_DECL(qemuDiskCacheV1)
+VIR_ENUM_DECL(qemuDiskCacheV2)
+
+VIR_ENUM_IMPL(qemuDiskCacheV1, VIR_DOMAIN_DISK_CACHE_LAST,
+              "default",
+              "off",
+              "off", /* writethrough not supported, so for safety, disable */
+              "on"); /* Old 'on' was equivalent to 'writeback' */
+
+VIR_ENUM_IMPL(qemuDiskCacheV2, VIR_DOMAIN_DISK_CACHE_LAST,
+              "default",
+              "none",
+              "writethrough",
+              "writeback");
+
+
 #define qemudLog(level, msg...) fprintf(stderr, msg)
 
 int qemudLoadDriverConfig(struct qemud_driver *driver,
@@ -398,8 +414,11 @@ int qemudExtractVersionInfo(const char *qemu,
         flags |= QEMUD_CMD_FLAG_UUID;
     if (strstr(help, "-domid"))
         flags |= QEMUD_CMD_FLAG_DOMID;
-    if (strstr(help, "-drive"))
+    if (strstr(help, "-drive")) {
         flags |= QEMUD_CMD_FLAG_DRIVE;
+        if (strstr(help, "cache=writethrough|writeback|none"))
+            flags |= QEMUD_CMD_FLAG_DRIVE_CACHE_V2;
+    }
     if (strstr(help, "boot=on"))
         flags |= QEMUD_CMD_FLAG_DRIVE_BOOT;
     if (version >= 9000)
@@ -591,6 +610,7 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
     return NULL;
 }
 
+
 static int qemudBuildCommandLineChrDevStr(virDomainChrDefPtr dev,
                                           char *buf,
                                           int buflen)
@@ -1015,11 +1035,20 @@ int qemudBuildCommandLine(virConnectPtr conn,
             if (bootable &&
                 disk->device == VIR_DOMAIN_DISK_DEVICE_DISK)
                 virBufferAddLit(&opt, ",boot=on");
-            if (disk->shared && !disk->readonly)
-                virBufferAddLit(&opt, ",cache=off");
             if (disk->driverType)
                 virBufferVSprintf(&opt, ",fmt=%s", disk->driverType);
 
+            if (disk->cachemode) {
+                const char *mode =
+                    (qemuCmdFlags & QEMUD_CMD_FLAG_DRIVE_CACHE_V2) ?
+                    qemuDiskCacheV2TypeToString(disk->cachemode) :
+                    qemuDiskCacheV1TypeToString(disk->cachemode);
+
+                virBufferVSprintf(&opt, ",cache=%s", mode);
+            } else if (disk->shared && !disk->readonly) {
+                virBufferAddLit(&opt, ",cache=off");
+            }
+
             if (virBufferError(&opt)) {
                 virReportOOMError(conn);
                 goto error;
@@ -1585,4 +1614,3 @@ cleanup:
     VIR_FREE(xml);
     return ret;
 }
-

src/qemu_conf.h

@@ -1,7 +1,7 @@
 /*
  * config.h: VM configuration management
  *
- * Copyright (C) 2006, 2007 Red Hat, Inc.
+ * Copyright (C) 2006, 2007, 2009 Red Hat, Inc.
  * Copyright (C) 2006 Daniel P. Berrange
  *
  * This library is free software; you can redistribute it and/or
@@ -53,6 +53,7 @@ enum qemud_cmd_flags {
                                                    * since it had a design bug blocking the entire monitor console */
     QEMUD_CMD_FLAG_MIGRATE_QEMU_TCP  = (1 << 10), /* New migration syntax after merge to QEMU with TCP transport */
     QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC = (1 << 11), /* New migration syntax after merge to QEMU with EXEC transport */
+    QEMUD_CMD_FLAG_DRIVE_CACHE_V2    = (1 << 12), /* Is the cache= flag wanting new v2 values */
 };
 
 /* Main driver state */

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.args

@@ -0,0 +1 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor pty -pidfile /nowhere/QEMUGuest1.pid -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,fmt=qcow2,cache=off -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2,fmt=raw -net none -serial none -parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-none.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='qcow2' cache='none'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.args

@@ -0,0 +1 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor pty -pidfile /nowhere/QEMUGuest1.pid -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,fmt=qcow2,cache=on -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2,fmt=raw -net none -serial none -parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wb.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='qcow2' cache='writeback'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.args

@@ -0,0 +1 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor pty -pidfile /nowhere/QEMUGuest1.pid -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,fmt=qcow2,cache=off -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2,fmt=raw -net none -serial none -parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v1-wt.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='qcow2' cache='writethrough'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.args

@@ -0,0 +1 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor pty -pidfile /nowhere/QEMUGuest1.pid -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,fmt=qcow2,cache=none -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2,fmt=raw -net none -serial none -parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-none.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='qcow2' cache='none'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.args

@@ -0,0 +1 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor pty -pidfile /nowhere/QEMUGuest1.pid -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,fmt=qcow2,cache=writeback -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2,fmt=raw -net none -serial none -parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wb.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='qcow2' cache='writeback'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.args

@@ -0,0 +1 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor pty -pidfile /nowhere/QEMUGuest1.pid -no-acpi -boot c -drive file=/dev/HostVG/QEMUGuest1,if=ide,index=0,fmt=qcow2,cache=writethrough -drive file=/dev/HostVG/QEMUGuest2,if=ide,media=cdrom,index=2,fmt=raw -net none -serial none -parallel none -usb

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-cache-v2-wt.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219200</memory>
+  <currentMemory>219200</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='qcow2' cache='writethrough'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -201,6 +201,16 @@ mymain(int argc, char **argv)
             QEMUD_CMD_FLAG_DRIVE_BOOT);
     DO_TEST("disk-drive-fmt-qcow", QEMUD_CMD_FLAG_DRIVE |
             QEMUD_CMD_FLAG_DRIVE_BOOT);
+    DO_TEST("disk-drive-shared", QEMUD_CMD_FLAG_DRIVE);
+    DO_TEST("disk-drive-cache-v1-wt", QEMUD_CMD_FLAG_DRIVE);
+    DO_TEST("disk-drive-cache-v1-wb", QEMUD_CMD_FLAG_DRIVE);
+    DO_TEST("disk-drive-cache-v1-none", QEMUD_CMD_FLAG_DRIVE);
+    DO_TEST("disk-drive-cache-v2-wt", QEMUD_CMD_FLAG_DRIVE |
+            QEMUD_CMD_FLAG_DRIVE_CACHE_V2);
+    DO_TEST("disk-drive-cache-v2-wb", QEMUD_CMD_FLAG_DRIVE |
+            QEMUD_CMD_FLAG_DRIVE_CACHE_V2);
+    DO_TEST("disk-drive-cache-v2-none", QEMUD_CMD_FLAG_DRIVE |
+            QEMUD_CMD_FLAG_DRIVE_CACHE_V2);
     DO_TEST("disk-usb", 0);
     DO_TEST("graphics-vnc", 0);
     DO_TEST("graphics-sdl", 0);

tests/qemuxml2xmltest.c

@@ -98,6 +98,9 @@ mymain(int argc, char **argv)
     DO_TEST("disk-xenvbd");
     DO_TEST("disk-usb");
     DO_TEST("disk-drive-fmt-qcow");
+    DO_TEST("disk-drive-cache-v1-wt");
+    DO_TEST("disk-drive-cache-v1-wb");
+    DO_TEST("disk-drive-cache-v1-none");
     DO_TEST("graphics-vnc");
     DO_TEST("graphics-sdl");
     DO_TEST("graphics-sdl-fullscreen");